/*
 *
 * Copyright (c) 2008-2010, Felix Bruns <felixbruns@web.de>
 * + параметр dabug
 * + параметр md5
 * + отправка данных с использованием jQuery
 */

function LastFM(options){
	/* Set default values for required options. */
	var apiKey    = options.apiKey    || '';
	var apiSecret = options.apiSecret || '';
	var apiUrl    = options.apiUrl    || window.location.protocol + '//ws.audioscrobbler.com/2.0/';
	var cache     = options.cache     || undefined;
	var log       = options.log     || function(){};
	var debug     = typeof(options.debug) == 'undefined' ? false : options.debug
	var md5       = options.md5       || md5;
	
	/* Set API key. */
	this.setApiKey = function(_apiKey){
		apiKey = _apiKey;
	};

	/* Set API key. */
	this.setApiSecret = function(_apiSecret){
		apiSecret = _apiSecret;
	};

	/* Set API URL. */
	this.setApiUrl = function(_apiUrl){
		apiUrl = _apiUrl;
	};

	/* Set cache. */
	this.setCache = function(_cache){
		cache = _cache;
	};

	/* Internal call (POST, GET). */
	var internalCall = function(params, callbacks, requestMethod)
	{
		var iframeTransport = requestMethod == "POST" && !jQuery.support.cors;
		if (!iframeTransport)	// если грузить json в iframe, то будет открываться диалог сохранения
		{
			params.format = 'json';	// 
		};
		
		if (debug) 
		{
			if (JSON && JSON.stringify)
			{
				var paramsRepr = JSON.stringify(params);
			}
			else
			{
				paramsRepr = [];
				for (var paramName in params)
				{
					paramsRepr.push('"'+paramName+'":"' + params[paramName] + '"');
				}
				paramsRepr = '{'+paramsRepr.join(',')+'}';
			}
			log("call " + (iframeTransport ? ' (iframe) ' : '') + params.method + paramsRepr);
		}
		
		/* Calculate cache hash. */
		var hash = auth.getApiSignature(params);

		/* Check cache. */
		if(typeof(cache) != 'undefined' && cache.contains(hash) && !cache.isExpired(hash)){
			if(typeof(callbacks.success) != 'undefined'){
				callbacks.success(cache.load(hash));
			}

			return;
		}
			
		if (iframeTransport)
		{
			/*
			 * Отправка POST у браузера без поддержки CORS
			 * методом iframe
			 */
			
			/* Create iframe element to post data. */
			var html   = document.getElementsByTagName('html')[0];
			
			var frameName = 'lastfmFrame_' + new Date().getTime(); 
			
			var iframe = document.createElement('iframe');
			html.appendChild(iframe);
			iframe.contentWindow.name = frameName;
			iframe.style.display = "none";
			
			var doc;
			
			// состояние формы с данными для отправки
			var formState = 'init';
			
			var form = document.createElement('form');
			form.target = frameName;
			form.action = apiUrl;
			form.method = "POST";
			form.acceptCharset = "UTF-8";
			
			/* Set iframe attributes. */
			iframe.width        = 1;
			iframe.height       = 1;
			iframe.style.border = 'none';
			iframe.onload       = function()
			{
				/* Remove iframe element. */
				if (formState == 'sent')
				{
			
					if (!debug)
					{
						// удаляем фрейм с задержкой, чтобы не было индикатора загрузки
						setTimeout(function()
						{
							html.removeChild(iframe);
							html.removeChild(form);
						},1500);
					};
				};
				
				formState = 'done';
				/* Call user callback. */
				if(typeof(callbacks.success) != 'undefined'){
					callbacks.success();
				}
			};

			
			
			/* Append iframe. */
			html.appendChild(form);
						
			/* Write POST parameters as input fields. */
			for(var param in params)
			{
				var input = document.createElement("input");
				input.type = "hidden";
				input.name = param;
				input.value = params[param];
				form.appendChild(input);
			};
			
			/* Write automatic form submission code. */
			formState = 'sent';
			
			form.submit();
		}
		else
		{
			// иначе справится и jquery
			var callback = function(data)
			{
			
				/* Is a cache available?. */
				if (typeof(cache) != 'undefined') 
				{
					var expiration = cache.getExpirationTime(params);
					
					if (expiration > 0) 
					{
						cache.store(hash, data, expiration);
					}
				}
				
				/* Call user callback. */
				if (typeof(data.error) != 'undefined') 
				{
					if (typeof(callbacks.error) != 'undefined') 
					{
						callbacks.error(data.error, data.message);
					}
				}
				else 
					if (typeof(callbacks.success) != 'undefined') 
					{
						callbacks.success(data);
					}
			};
		
			jQuery.ajax({
				url: apiUrl,
				dataType: 'json',
				data: params,
				success: function(data, textStatus, jqXHR)
				{
					if (debug) 
					{
						log('success ' + data + ' (' + textStatus +')');
					}
					callback(data);
				},
				error: function(jqXHR, textStatus, errorThrown) 
				{
					if (typeof(callbacks.error) != 'undefined') 
					{
						if (debug) 
						{
							log('error ' + textStatus + ' (' + errorThrown +')');
						};
						callbacks.error(textStatus, errorThrown);
					}
				},
				type: requestMethod,
				scriptCharset: 'UTF-8',
				crossDomain: true
			});
		};
		
	};

	/* Normal method call. */
	var call = function(method, params, callbacks, requestMethod){
		/* Set default values. */
		params        = params        || {};
		callbacks     = callbacks     || {};
		requestMethod = requestMethod || 'GET';

		/* Add parameters. */
		params.method  = method;
		params.api_key = apiKey;

		/* Call method. */
		internalCall(params, callbacks, requestMethod);
	};

	/* Signed method call. */
	var signedCall = function(method, params, session, callbacks, requestMethod){
		/* Set default values. */
		params        = params        || {};
		callbacks     = callbacks     || {};
		requestMethod = requestMethod || 'GET';

		/* Add parameters. */
		params.method  = method;
		params.api_key = apiKey;

		/* Add session key. */
		if(session && typeof(session.key) != 'undefined'){
			params.sk = session.key;
		}

		/* Get API signature. */
		params.api_sig = auth.getApiSignature(params);

		/* Call method. */
		internalCall(params, callbacks, requestMethod);
	};

	/* Album methods. */
	this.album = {
		addTags : function(params, session, callbacks){
			/* Build comma separated tags string. */
			if(typeof(params.tags) == 'object'){
				params.tags = params.tags.join(',');
			}

			signedCall('album.addTags', params, session, callbacks, 'POST');
		},

		getBuylinks : function(params, callbacks){
			call('album.getBuylinks', params, callbacks);
		},

		getInfo : function(params, callbacks){
			call('album.getInfo', params, callbacks);
		},

		getTags : function(params, session, callbacks){
			signedCall('album.getTags', params, session, callbacks);
		},

		removeTag : function(params, session, callbacks){
			signedCall('album.removeTag', params, session, callbacks, 'POST');
		},

		search : function(params, callbacks){
			call('album.search', params, callbacks);
		},

		share : function(params, session, callbacks){
			/* Build comma separated recipients string. */
			if(typeof(params.recipient) == 'object'){
				params.recipient = params.recipient.join(',');
			}

			signedCall('album.share', params, callbacks);
		}
	};

	/* Artist methods. */
	this.artist = {
		addTags : function(params, session, callbacks){
			/* Build comma separated tags string. */
			if(typeof(params.tags) == 'object'){
				params.tags = params.tags.join(',');
			}

			signedCall('artist.addTags', params, session, callbacks, 'POST');
		},

		getCorrection : function(params, callbacks){
			call('artist.getCorrection', params, callbacks);
		},

		getEvents : function(params, callbacks){
			call('artist.getEvents', params, callbacks);
		},

		getImages : function(params, callbacks){
			call('artist.getImages', params, callbacks);
		},

		getInfo : function(params, callbacks){
			call('artist.getInfo', params, callbacks);
		},

		getPastEvents : function(params, callbacks){
			call('artist.getPastEvents', params, callbacks);
		},

		getPodcast : function(params, callbacks){
			call('artist.getPodcast', params, callbacks);
		},

		getShouts : function(params, callbacks){
			call('artist.getShouts', params, callbacks);
		},

		getSimilar : function(params, callbacks){
			call('artist.getSimilar', params, callbacks);
		},

		getTags : function(params, session, callbacks){
			signedCall('artist.getTags', params, session, callbacks);
		},

		getTopAlbums : function(params, callbacks){
			call('artist.getTopAlbums', params, callbacks);
		},

		getTopFans : function(params, callbacks){
			call('artist.getTopFans', params, callbacks);
		},

		getTopTags : function(params, callbacks){
			call('artist.getTopTags', params, callbacks);
		},

		getTopTracks : function(params, callbacks){
			call('artist.getTopTracks', params, callbacks);
		},

		removeTag : function(params, session, callbacks){
			signedCall('artist.removeTag', params, session, callbacks, 'POST');
		},

		search : function(params, callbacks){
			call('artist.search', params, callbacks);
		},

		share : function(params, session, callbacks){
			/* Build comma separated recipients string. */
			if(typeof(params.recipient) == 'object'){
				params.recipient = params.recipient.join(',');
			}

			signedCall('artist.share', params, session, callbacks, 'POST');
		},

		shout : function(params, session, callbacks){
			signedCall('artist.shout', params, session, callbacks, 'POST');
		}
	};

	/* Auth methods. */
	this.auth = {
		getMobileSession : function(params, callbacks){
			/* Set new params object with authToken. */
			params = {
				username  : params.username,
				authToken : md5(params.username + md5(params.password))
			};

			signedCall('auth.getMobileSession', params, null, callbacks);
		},

		getSession : function(params, callbacks){
			signedCall('auth.getSession', params, null, callbacks);
		},

		getToken : function(callbacks){
			signedCall('auth.getToken', null, null, callbacks);
		},

		/* Deprecated. Security hole was fixed. */
		getWebSession : function(callbacks){
			/* Save API URL and set new one (needs to be done due to a cookie!). */
			var previuousApiUrl = apiUrl;

			apiUrl = window.location.protocol + '//ext.last.fm/2.0/';

			signedCall('auth.getWebSession', null, null, callbacks);

			/* Restore API URL. */
			apiUrl = previuousApiUrl;
		}
	};

	/* Chart methods. */
	this.chart = {
		getHypedArtists : function(params, session, callbacks){
			call('chart.getHypedArtists', params, callbacks);
		},

		getHypedTracks : function(params, session, callbacks){
			call('chart.getHypedTracks', params, callbacks);
		},

		getLovedTracks : function(params, session, callbacks){
			call('chart.getLovedTracks', params, callbacks);
		},

		getTopArtists : function(params, session, callbacks){
			call('chart.getTopArtists', params, callbacks);
		},

		getTopTags : function(params, session, callbacks){
			call('chart.getTopTags', params, callbacks);
		},

		getTopTracks : function(params, session, callbacks){
			call('chart.getTopTracks', params, callbacks);
		}
	};

	/* Event methods. */
	this.event = {
		attend : function(params, session, callbacks){
			signedCall('event.attend', params, session, callbacks, 'POST');
		},

		getAttendees : function(params, session, callbacks){
			call('event.getAttendees', params, callbacks);
		},

		getInfo : function(params, callbacks){
			call('event.getInfo', params, callbacks);
		},

		getShouts : function(params, callbacks){
			call('event.getShouts', params, callbacks);
		},

		share : function(params, session, callbacks){
			/* Build comma separated recipients string. */
			if(typeof(params.recipient) == 'object'){
				params.recipient = params.recipient.join(',');
			}

			signedCall('event.share', params, session, callbacks, 'POST');
		},

		shout : function(params, session, callbacks){
			signedCall('event.shout', params, session, callbacks, 'POST');
		}
	};

	/* Geo methods. */
	this.geo = {
		getEvents : function(params, callbacks){
			call('geo.getEvents', params, callbacks);
		},

		getMetroArtistChart : function(params, callbacks){
			call('geo.getMetroArtistChart', params, callbacks);
		},

		getMetroHypeArtistChart : function(params, callbacks){
			call('geo.getMetroHypeArtistChart', params, callbacks);
		},

		getMetroHypeTrackChart : function(params, callbacks){
			call('geo.getMetroHypeTrackChart', params, callbacks);
		},

		getMetroTrackChart : function(params, callbacks){
			call('geo.getMetroTrackChart', params, callbacks);
		},

		getMetroUniqueArtistChart : function(params, callbacks){
			call('geo.getMetroUniqueArtistChart', params, callbacks);
		},

		getMetroUniqueTrackChart : function(params, callbacks){
			call('geo.getMetroUniqueTrackChart', params, callbacks);
		},

		getMetroWeeklyChartlist : function(params, callbacks){
			call('geo.getMetroWeeklyChartlist', params, callbacks);
		},

		getMetros : function(params, callbacks){
			call('geo.getMetros', params, callbacks);
		},

		getTopArtists : function(params, callbacks){
			call('geo.getTopArtists', params, callbacks);
		},

		getTopTracks : function(params, callbacks){
			call('geo.getTopTracks', params, callbacks);
		}
	};

	/* Group methods. */
	this.group = {
		getHype : function(params, callbacks){
			call('group.getHype', params, callbacks);
		},

		getMembers : function(params, callbacks){
			call('group.getMembers', params, callbacks);
		},

		getWeeklyAlbumChart : function(params, callbacks){
			call('group.getWeeklyAlbumChart', params, callbacks);
		},

		getWeeklyArtistChart : function(params, callbacks){
			call('group.getWeeklyArtistChart', params, callbacks);
		},

		getWeeklyChartList : function(params, callbacks){
			call('group.getWeeklyChartList', params, callbacks);
		},

		getWeeklyTrackChart : function(params, callbacks){
			call('group.getWeeklyTrackChart', params, callbacks);
		}
	};

	/* Library methods. */
	this.library = {
		addAlbum : function(params, session, callbacks){
			signedCall('library.addAlbum', params, session, callbacks, 'POST');
		},

		addArtist : function(params, session, callbacks){
			signedCall('library.addArtist', params, session, callbacks, 'POST');
		},

		addTrack : function(params, session, callbacks){
			signedCall('library.addTrack', params, session, callbacks, 'POST');
		},

		getAlbums : function(params, callbacks){
			call('library.getAlbums', params, callbacks);
		},

		getArtists : function(params, callbacks){
			call('library.getArtists', params, callbacks);
		},

		getTracks : function(params, callbacks){
			call('library.getTracks', params, callbacks);
		}
	};

	/* Playlist methods. */
	this.playlist = {
		addTrack : function(params, session, callbacks){
			signedCall('playlist.addTrack', params, session, callbacks, 'POST');
		},

		create : function(params, session, callbacks){
			signedCall('playlist.create', params, session, callbacks, 'POST');
		},

		fetch : function(params, callbacks){
			call('playlist.fetch', params, callbacks);
		}
	};

	/* Radio methods. */
	this.radio = {
		getPlaylist : function(params, session, callbacks){
			signedCall('radio.getPlaylist', params, session, callbacks);
		},

		search : function(params, session, callbacks){
			signedCall('radio.search', params, session, callbacks);
		},

		tune : function(params, session, callbacks){
			signedCall('radio.tune', params, session, callbacks);
		}
	};

	/* Tag methods. */
	this.tag = {
		getInfo : function(params, callbacks){
			call('tag.getInfo', params, callbacks);
		},

		getSimilar : function(params, callbacks){
			call('tag.getSimilar', params, callbacks);
		},

		getTopAlbums : function(params, callbacks){
			call('tag.getTopAlbums', params, callbacks);
		},

		getTopArtists : function(params, callbacks){
			call('tag.getTopArtists', params, callbacks);
		},

		getTopTags : function(callbacks){
			call('tag.getTopTags', null, callbacks);
		},

		getTopTracks : function(params, callbacks){
			call('tag.getTopTracks', params, callbacks);
		},

		getWeeklyArtistChart : function(params, callbacks){
			call('tag.getWeeklyArtistChart', params, callbacks);
		},

		getWeeklyChartList : function(params, callbacks){
			call('tag.getWeeklyChartList', params, callbacks);
		},

		search : function(params, callbacks){
			call('tag.search', params, callbacks);
		}
	};

	/* Tasteometer method. */
	this.tasteometer = {
		compare : function(params, callbacks){
			call('tasteometer.compare', params, callbacks);
		},

		compareGroup : function(params, callbacks){
			call('tasteometer.compareGroup', params, callbacks);
		}
	};

	/* Track methods. */
	this.track = {
		addTags : function(params, session, callbacks){
			signedCall('track.addTags', params, session, callbacks, 'POST');
		},

		ban : function(params, session, callbacks){
			signedCall('track.ban', params, session, callbacks, 'POST');
		},

		getBuylinks : function(params, callbacks){
			call('track.getBuylinks', params, callbacks);
		},

		getCorrection : function(params, callbacks){
			call('track.getCorrection', params, callbacks);
		},

		getFingerprintMetadata : function(params, callbacks){
			call('track.getFingerprintMetadata', params, callbacks);
		},

		getInfo : function(params, callbacks){
			call('track.getInfo', params, callbacks);
		},

		getShouts : function(params, callbacks){
			call('track.getShouts', params, callbacks);
		},

		getSimilar : function(params, callbacks){
			call('track.getSimilar', params, callbacks);
		},

		getTags : function(params, session, callbacks){
			signedCall('track.getTags', params, session, callbacks);
		},

		getTopFans : function(params, callbacks){
			call('track.getTopFans', params, callbacks);
		},

		getTopTags : function(params, callbacks){
			call('track.getTopTags', params, callbacks);
		},

		love : function(params, session, callbacks){
			signedCall('track.love', params, session, callbacks, 'POST');
		},

		removeTag : function(params, session, callbacks){
			signedCall('track.removeTag', params, session, callbacks, 'POST');
		},

		scrobble : function(params, session, callbacks){
			/* Flatten an array of multiple tracks into an object with "array notation". */
			if(params.constructor.toString().indexOf("Array") != -1){
				var p = {};

				for(i in params){
					for(j in params[i]){
						p[j + '[' + i + ']'] = params[i][j];
					}
				}

				params = p;
			}

			signedCall('track.scrobble', params, session, callbacks, 'POST');
		},

		search : function(params, callbacks){
			call('track.search', params, callbacks);
		},

		share : function(params, session, callbacks){
			/* Build comma separated recipients string. */
			if(typeof(params.recipient) == 'object'){
				params.recipient = params.recipient.join(',');
			}

			signedCall('track.share', params, session, callbacks, 'POST');
		},

		unban : function(params, session, callbacks){
			signedCall('track.unban', params, session, callbacks, 'POST');
		},

		unlove : function(params, session, callbacks){
			signedCall('track.unlove', params, session, callbacks, 'POST');
		},

		updateNowPlaying : function(params, session, callbacks){
			signedCall('track.updateNowPlaying', params, session, callbacks, 'POST');
		}
	};

	/* User methods. */
	this.user = {
		getArtistTracks : function(params, callbacks){
			call('user.getArtistTracks', params, callbacks);
		},

		getBannedTracks : function(params, callbacks){
			call('user.getBannedTracks', params, callbacks);
		},

		getEvents : function(params, callbacks){
			call('user.getEvents', params, callbacks);
		},

		getFriends : function(params, callbacks){
			call('user.getFriends', params, callbacks);
		},

		getInfo : function(params, callbacks){
			call('user.getInfo', params, callbacks);
		},

		getLovedTracks : function(params, callbacks){
			call('user.getLovedTracks', params, callbacks);
		},

		getNeighbours : function(params, callbacks){
			call('user.getNeighbours', params, callbacks);
		},

		getNewReleases : function(params, callbacks){
			call('user.getNewReleases', params, callbacks);
		},

		getPastEvents : function(params, callbacks){
			call('user.getPastEvents', params, callbacks);
		},

		getPersonalTracks : function(params, callbacks){
			call('user.getPersonalTracks', params, callbacks);
		},

		getPlaylists : function(params, callbacks){
			call('user.getPlaylists', params, callbacks);
		},

		getRecentStations : function(params, session, callbacks){
			signedCall('user.getRecentStations', params, session, callbacks);
		},

		getRecentTracks : function(params, callbacks){
			call('user.getRecentTracks', params, callbacks);
		},

		getRecommendedArtists : function(params, session, callbacks){
			signedCall('user.getRecommendedArtists', params, session, callbacks);
		},

		getRecommendedEvents : function(params, session, callbacks){
			signedCall('user.getRecommendedEvents', params, session, callbacks);
		},

		getShouts : function(params, callbacks){
			call('user.getShouts', params, callbacks);
		},

		getTopAlbums : function(params, callbacks){
			call('user.getTopAlbums', params, callbacks);
		},

		getTopArtists : function(params, callbacks){
			call('user.getTopArtists', params, callbacks);
		},

		getTopTags : function(params, callbacks){
			call('user.getTopTags', params, callbacks);
		},

		getTopTracks : function(params, callbacks){
			call('user.getTopTracks', params, callbacks);
		},

		getWeeklyAlbumChart : function(params, callbacks){
			call('user.getWeeklyAlbumChart', params, callbacks);
		},

		getWeeklyArtistChart : function(params, callbacks){
			call('user.getWeeklyArtistChart', params, callbacks);
		},

		getWeeklyChartList : function(params, callbacks){
			call('user.getWeeklyChartList', params, callbacks);
		},

		getWeeklyTrackChart : function(params, callbacks){
			call('user.getWeeklyTrackChart', params, callbacks);
		},

		shout : function(params, session, callbacks){
			signedCall('user.shout', params, session, callbacks, 'POST');
		}
	};

	/* Venue methods. */
	this.venue = {
		getEvents : function(params, callbacks){
			call('venue.getEvents', params, callbacks);
		},

		getPastEvents : function(params, callbacks){
			call('venue.getPastEvents', params, callbacks);
		},

		search : function(params, callbacks){
			call('venue.search', params, callbacks);
		}
	};

	/* Private auth methods. */
	var auth = {
		getApiSignature : function(params){
			var keys   = [];
			var string = '';

			for(var key in params){
				keys.push(key);
			}

			keys.sort();

			for(var index in keys){
				var key = keys[index];

				string += key + params[key];
			}

			string += apiSecret;

			/* Needs lastfm.api.md5.js. */
			return md5(string);
		}
	};
}
